cyst found on MRI

I would llike to know if anyone has any info they can share on cysts found in GBM patients. My mother-in-law was diagnosed in May with a Grade IV Brain Tumor. She has under gone Chemo & Radiation, still taking Chemo once a month. On her last visit she had a MRI, and her Doc. said that it would be a few days before the results were ready. Which is pretty confusing since it's never taken long at all to get results, usually within a few mins. there ready. Anyway, I called back two days later and the nurse,( we're really good friends, so she told us what she could without going too far) that the notes didn't really show any progression, but did have something about a cyst that was spotted. We have not been able to find any more, and was just wondering how concerned we should be. Also, he said that there was scar tissue, but I read that it could be GBM tissue. Any info would be greatly appreciated.

RE: cyst found on MRI

Back in 11/07 when I was originally diagnosed (GBM) it was all tumor. After two resection surgeries, chemo (temodar), and radiation, an MRI found a cyst surrounded by tumor cells. The doc said if I had another surgery to drain the cyst and debulk the tumor I could do sterostatic radiotherapy-temodar had failed. So I guess cyst's happen-doc didn't say why, seemed like he didn't really know.

RE: cyst found on MRI

My husband developed a large cyst after the first surgery. The doctor said it may be caused by fluid collection from dead cancer cells from the tumor dying off from chemo/rads. It was also surrounded by cancerous tissue. It was in a location that caused a lot of problems and pressure. He finally had a resection that removed both the tumor and the cyst. I think just like the tumor, the seriousness depends on the location and the problems it is causing.